US PATENT SUBCLASS 323 / 291
.~ Using an electronic tube as the final control device

Current as of: June, 1999
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323 /   HD   ELECTRICITY: POWER SUPPLY OR REGULATION SYSTEMS

234  DF  OUTPUT LEVEL RESPONSIVE {6}
291.~ Using an electronic tube as the final control device {1}
292  DF  .~.~> With a three or more terminal semiconductive device in control circuit

DEFINITION

Classification: 323/291

Using an electronic tube as the final control device:

(under subclass 234) Subject matter wherein the final control device within the output level responsive system is an electric space discharge device such as a vacuum or gas tube.